11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * fs/bfs/inode.c 31da177e4SLinus Torvalds * BFS superblock and inode operations. 4cea58224SAndrew Morton * Copyright (C) 1999-2006 Tigran Aivazian <aivazian.tigran@gmail.com> 51da177e4SLinus Torvalds * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. 6fac92becSAndrew Stribblehill * 7fac92becSAndrew Stribblehill * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/module.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 121da177e4SLinus Torvalds #include <linux/slab.h> 131da177e4SLinus Torvalds #include <linux/init.h> 141da177e4SLinus Torvalds #include <linux/fs.h> 151da177e4SLinus Torvalds #include <linux/buffer_head.h> 161da177e4SLinus Torvalds #include <linux/vfs.h> 17a9185b41SChristoph Hellwig #include <linux/writeback.h> 18e2e40f2cSChristoph Hellwig #include <linux/uio.h> 197c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 201da177e4SLinus Torvalds #include "bfs.h" 211da177e4SLinus Torvalds 22cea58224SAndrew Morton MODULE_AUTHOR("Tigran Aivazian <aivazian.tigran@gmail.com>"); 231da177e4SLinus Torvalds MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); 241da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #undef DEBUG 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #ifdef DEBUG 291da177e4SLinus Torvalds #define dprintf(x...) printf(x) 301da177e4SLinus Torvalds #else 311da177e4SLinus Torvalds #define dprintf(x...) 321da177e4SLinus Torvalds #endif 331da177e4SLinus Torvalds 34e33ab086SDavid Howells struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 351da177e4SLinus Torvalds { 361da177e4SLinus Torvalds struct bfs_inode *di; 37e33ab086SDavid Howells struct inode *inode; 381da177e4SLinus Torvalds struct buffer_head *bh; 391da177e4SLinus Torvalds int block, off; 401da177e4SLinus Torvalds 41e33ab086SDavid Howells inode = iget_locked(sb, ino); 42821ff77cSDan Carpenter if (!inode) 43e33ab086SDavid Howells return ERR_PTR(-ENOMEM); 44e33ab086SDavid Howells if (!(inode->i_state & I_NEW)) 45e33ab086SDavid Howells return inode; 46e33ab086SDavid Howells 47f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 481da177e4SLinus Torvalds printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 49e33ab086SDavid Howells goto error; 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 531da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 541da177e4SLinus Torvalds if (!bh) { 55f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 56f433dc56SDmitri Vorobiev ino); 57e33ab086SDavid Howells goto error; 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 611da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 621da177e4SLinus Torvalds 63fac92becSAndrew Stribblehill inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 64fac92becSAndrew Stribblehill if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 651da177e4SLinus Torvalds inode->i_mode |= S_IFDIR; 661da177e4SLinus Torvalds inode->i_op = &bfs_dir_inops; 671da177e4SLinus Torvalds inode->i_fop = &bfs_dir_operations; 68fac92becSAndrew Stribblehill } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 691da177e4SLinus Torvalds inode->i_mode |= S_IFREG; 701da177e4SLinus Torvalds inode->i_op = &bfs_file_inops; 711da177e4SLinus Torvalds inode->i_fop = &bfs_file_operations; 721da177e4SLinus Torvalds inode->i_mapping->a_ops = &bfs_aops; 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 75fac92becSAndrew Stribblehill BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 76fac92becSAndrew Stribblehill BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 77f433dc56SDmitri Vorobiev BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 787f5b82b8SEric W. Biederman i_uid_write(inode, le32_to_cpu(di->i_uid)); 797f5b82b8SEric W. Biederman i_gid_write(inode, le32_to_cpu(di->i_gid)); 80bfe86848SMiklos Szeredi set_nlink(inode, le32_to_cpu(di->i_nlink)); 811da177e4SLinus Torvalds inode->i_size = BFS_FILESIZE(di); 821da177e4SLinus Torvalds inode->i_blocks = BFS_FILEBLOCKS(di); 83fac92becSAndrew Stribblehill inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 84fac92becSAndrew Stribblehill inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 85fac92becSAndrew Stribblehill inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 861da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 871da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 881da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds brelse(bh); 91e33ab086SDavid Howells unlock_new_inode(inode); 92e33ab086SDavid Howells return inode; 93e33ab086SDavid Howells 94e33ab086SDavid Howells error: 95e33ab086SDavid Howells iget_failed(inode); 96e33ab086SDavid Howells return ERR_PTR(-EIO); 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 999df2f851SAl Viro static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p) 1009df2f851SAl Viro { 1019df2f851SAl Viro if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) { 1029df2f851SAl Viro printf("Bad inode number %s:%08x\n", sb->s_id, ino); 1039df2f851SAl Viro return ERR_PTR(-EIO); 1049df2f851SAl Viro } 1059df2f851SAl Viro 1069df2f851SAl Viro ino -= BFS_ROOT_INO; 1079df2f851SAl Viro 1089df2f851SAl Viro *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK); 1099df2f851SAl Viro if (!*p) { 1109df2f851SAl Viro printf("Unable to read inode %s:%08x\n", sb->s_id, ino); 1119df2f851SAl Viro return ERR_PTR(-EIO); 1129df2f851SAl Viro } 1139df2f851SAl Viro 1149df2f851SAl Viro return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK; 1159df2f851SAl Viro } 1169df2f851SAl Viro 117a9185b41SChristoph Hellwig static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) 1181da177e4SLinus Torvalds { 1194427f0c3SAl Viro struct bfs_sb_info *info = BFS_SB(inode->i_sb); 120fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 121fac92becSAndrew Stribblehill unsigned long i_sblock; 1221da177e4SLinus Torvalds struct bfs_inode *di; 1231da177e4SLinus Torvalds struct buffer_head *bh; 1244427f0c3SAl Viro int err = 0; 1251da177e4SLinus Torvalds 126fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 127fac92becSAndrew Stribblehill 1289df2f851SAl Viro di = find_inode(inode->i_sb, ino, &bh); 1299df2f851SAl Viro if (IS_ERR(di)) 1309df2f851SAl Viro return PTR_ERR(di); 1311da177e4SLinus Torvalds 1323f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1331da177e4SLinus Torvalds 134fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 135fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1361da177e4SLinus Torvalds else 137fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1381da177e4SLinus Torvalds 139fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 140fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 1417f5b82b8SEric W. Biederman di->i_uid = cpu_to_le32(i_uid_read(inode)); 1427f5b82b8SEric W. Biederman di->i_gid = cpu_to_le32(i_gid_read(inode)); 143fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 144fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 145fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 146fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 147fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 148fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 149fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 150fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds mark_buffer_dirty(bh); 153a9185b41SChristoph Hellwig if (wbc->sync_mode == WB_SYNC_ALL) { 1544427f0c3SAl Viro sync_dirty_buffer(bh); 1554427f0c3SAl Viro if (buffer_req(bh) && !buffer_uptodate(bh)) 1564427f0c3SAl Viro err = -EIO; 1574427f0c3SAl Viro } 1581da177e4SLinus Torvalds brelse(bh); 1593f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1604427f0c3SAl Viro return err; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 1639df2f851SAl Viro static void bfs_evict_inode(struct inode *inode) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1661da177e4SLinus Torvalds struct bfs_inode *di; 1671da177e4SLinus Torvalds struct buffer_head *bh; 1681da177e4SLinus Torvalds struct super_block *s = inode->i_sb; 1691da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 170fac92becSAndrew Stribblehill struct bfs_inode_info *bi = BFS_I(inode); 1711da177e4SLinus Torvalds 172fac92becSAndrew Stribblehill dprintf("ino=%08lx\n", ino); 1731da177e4SLinus Torvalds 17491b0abe3SJohannes Weiner truncate_inode_pages_final(&inode->i_data); 1759df2f851SAl Viro invalidate_inode_buffers(inode); 176dbd5768fSJan Kara clear_inode(inode); 177fef26658SMark Fasheh 1789df2f851SAl Viro if (inode->i_nlink) 1791da177e4SLinus Torvalds return; 1801da177e4SLinus Torvalds 1819df2f851SAl Viro di = find_inode(s, inode->i_ino, &bh); 1829df2f851SAl Viro if (IS_ERR(di)) 1839df2f851SAl Viro return; 1849df2f851SAl Viro 1853f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1869df2f851SAl Viro /* clear on-disk inode */ 1879df2f851SAl Viro memset(di, 0, sizeof(struct bfs_inode)); 188f433dc56SDmitri Vorobiev mark_buffer_dirty(bh); 189f433dc56SDmitri Vorobiev brelse(bh); 190f433dc56SDmitri Vorobiev 191fac92becSAndrew Stribblehill if (bi->i_dsk_ino) { 1927e46aa5cSAl Viro if (bi->i_sblock) 1937e46aa5cSAl Viro info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 1941da177e4SLinus Torvalds info->si_freei++; 195fac92becSAndrew Stribblehill clear_bit(ino, info->si_imap); 1961da85fdfSFabian Frederick bfs_dump_imap("delete_inode", s); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199f433dc56SDmitri Vorobiev /* 200f433dc56SDmitri Vorobiev * If this was the last file, make the previous block 201f433dc56SDmitri Vorobiev * "last block of the last file" even if there is no 202f433dc56SDmitri Vorobiev * real file there, saves us 1 gap. 203f433dc56SDmitri Vorobiev */ 2044e29d50aSArtem Bityutskiy if (info->si_lf_eblk == bi->i_eblock) 205f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2063f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2123f165e4cSDmitri Vorobiev 213e1f89ec9SEric Sesterhenn if (!info) 214e1f89ec9SEric Sesterhenn return; 215e1f89ec9SEric Sesterhenn 2163f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2171da177e4SLinus Torvalds kfree(info->si_imap); 2181da177e4SLinus Torvalds kfree(info); 2191da177e4SLinus Torvalds s->s_fs_info = NULL; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 222726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2231da177e4SLinus Torvalds { 224726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2251da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2261da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2271da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2281da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2291da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2301da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2311da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2321da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2331da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2341da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2351da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2361da177e4SLinus Torvalds return 0; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 239e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds struct bfs_inode_info *bi; 244e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2451da177e4SLinus Torvalds if (!bi) 2461da177e4SLinus Torvalds return NULL; 2471da177e4SLinus Torvalds return &bi->vfs_inode; 2481da177e4SLinus Torvalds } 2491da177e4SLinus Torvalds 250fa0d7e3dSNick Piggin static void bfs_i_callback(struct rcu_head *head) 251fa0d7e3dSNick Piggin { 252fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 253fa0d7e3dSNick Piggin kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 254fa0d7e3dSNick Piggin } 255fa0d7e3dSNick Piggin 2561da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2571da177e4SLinus Torvalds { 258fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, bfs_i_callback); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 26151cc5068SAlexey Dobriyan static void init_once(void *foo) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 268758b4440SFabian Frederick static int __init init_inodecache(void) 2691da177e4SLinus Torvalds { 2701da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2711da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 272fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 2735d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 27420c2df83SPaul Mundt init_once); 2751da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2761da177e4SLinus Torvalds return -ENOMEM; 2771da177e4SLinus Torvalds return 0; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static void destroy_inodecache(void) 2811da177e4SLinus Torvalds { 2828c0a8537SKirill A. Shutemov /* 2838c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 2848c0a8537SKirill A. Shutemov * destroy cache. 2858c0a8537SKirill A. Shutemov */ 2868c0a8537SKirill A. Shutemov rcu_barrier(); 2871a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds 290ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 2911da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 2921da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 2931da177e4SLinus Torvalds .write_inode = bfs_write_inode, 2949df2f851SAl Viro .evict_inode = bfs_evict_inode, 2951da177e4SLinus Torvalds .put_super = bfs_put_super, 2961da177e4SLinus Torvalds .statfs = bfs_statfs, 2971da177e4SLinus Torvalds }; 2981da177e4SLinus Torvalds 2991da85fdfSFabian Frederick void bfs_dump_imap(const char *prefix, struct super_block *s) 3001da177e4SLinus Torvalds { 301fac92becSAndrew Stribblehill #ifdef DEBUG 3021da177e4SLinus Torvalds int i; 3031da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds if (!tmpbuf) 3061da177e4SLinus Torvalds return; 3071da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3081da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3091da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3101da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3111da177e4SLinus Torvalds else 3121da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3131da177e4SLinus Torvalds } 314f433dc56SDmitri Vorobiev printf("BFS-fs: %s: lasti=%08lx <%s>\n", 315f433dc56SDmitri Vorobiev prefix, BFS_SB(s)->si_lasti, tmpbuf); 3161da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3171da177e4SLinus Torvalds #endif 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3211da177e4SLinus Torvalds { 3224e29d50aSArtem Bityutskiy struct buffer_head *bh, *sbh; 3231da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3241da177e4SLinus Torvalds struct inode *inode; 325fac92becSAndrew Stribblehill unsigned i, imap_len; 3261da177e4SLinus Torvalds struct bfs_sb_info *info; 3275998649fSAl Viro int ret = -EINVAL; 328e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3291da177e4SLinus Torvalds 330f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 331ba13d597SJan Blunck if (!info) 3321da177e4SLinus Torvalds return -ENOMEM; 3335998649fSAl Viro mutex_init(&info->bfs_lock); 3341da177e4SLinus Torvalds s->s_fs_info = info; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3371da177e4SLinus Torvalds 3384e29d50aSArtem Bityutskiy sbh = sb_bread(s, 0); 3394e29d50aSArtem Bityutskiy if (!sbh) 3401da177e4SLinus Torvalds goto out; 3414e29d50aSArtem Bityutskiy bfs_sb = (struct bfs_super_block *)sbh->b_data; 342fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3431da177e4SLinus Torvalds if (!silent) 3441da177e4SLinus Torvalds printf("No BFS filesystem on %s (magic=%08x)\n", 345fac92becSAndrew Stribblehill s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3465998649fSAl Viro goto out1; 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3491da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 352e1f89ec9SEric Sesterhenn 353e1f89ec9SEric Sesterhenn if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 354e1f89ec9SEric Sesterhenn printf("Superblock is corrupted\n"); 3555998649fSAl Viro goto out1; 356e1f89ec9SEric Sesterhenn } 357e1f89ec9SEric Sesterhenn 358f433dc56SDmitri Vorobiev info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 359f433dc56SDmitri Vorobiev sizeof(struct bfs_inode) 3601da177e4SLinus Torvalds + BFS_ROOT_INO - 1; 361f433dc56SDmitri Vorobiev imap_len = (info->si_lasti / 8) + 1; 362f8314dc6SPanagiotis Issaris info->si_imap = kzalloc(imap_len, GFP_KERNEL); 3631da177e4SLinus Torvalds if (!info->si_imap) 3645998649fSAl Viro goto out1; 3651da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3661da177e4SLinus Torvalds set_bit(i, info->si_imap); 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds s->s_op = &bfs_sops; 369e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 370e33ab086SDavid Howells if (IS_ERR(inode)) { 371e33ab086SDavid Howells ret = PTR_ERR(inode); 3725998649fSAl Viro goto out2; 3731da177e4SLinus Torvalds } 37448fde701SAl Viro s->s_root = d_make_root(inode); 3751da177e4SLinus Torvalds if (!s->s_root) { 376e33ab086SDavid Howells ret = -ENOMEM; 3775998649fSAl Viro goto out2; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 380f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 381f433dc56SDmitri Vorobiev info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 382f433dc56SDmitri Vorobiev - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 3831da177e4SLinus Torvalds info->si_freei = 0; 3841da177e4SLinus Torvalds info->si_lf_eblk = 0; 38550682bb4SEric Sesterhenn 38650682bb4SEric Sesterhenn /* can we read the last block? */ 38750682bb4SEric Sesterhenn bh = sb_bread(s, info->si_blocks - 1); 38850682bb4SEric Sesterhenn if (!bh) { 38950682bb4SEric Sesterhenn printf("Last block not available: %lu\n", info->si_blocks - 1); 39050682bb4SEric Sesterhenn ret = -EIO; 3915998649fSAl Viro goto out3; 39250682bb4SEric Sesterhenn } 39350682bb4SEric Sesterhenn brelse(bh); 39450682bb4SEric Sesterhenn 395c2b513dfSAl Viro bh = NULL; 3961da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 397c2b513dfSAl Viro struct bfs_inode *di; 398c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 399c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 40075b25b4cSDmitri Vorobiev unsigned long eblock; 401c2b513dfSAl Viro 402c2b513dfSAl Viro if (!off) { 403c2b513dfSAl Viro brelse(bh); 404c2b513dfSAl Viro bh = sb_bread(s, block); 405c2b513dfSAl Viro } 406c2b513dfSAl Viro 407c2b513dfSAl Viro if (!bh) 408c2b513dfSAl Viro continue; 409c2b513dfSAl Viro 410c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 411c2b513dfSAl Viro 412e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 413e1f89ec9SEric Sesterhenn 414e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 415e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 416e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 417e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 418e1f89ec9SEric Sesterhenn 419e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 420e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 421e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 4225f9f48f5SRakesh Pandit (i_eoff != le32_to_cpu(-1) && i_eoff > s_size) || 423e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 424e1f89ec9SEric Sesterhenn 425e1f89ec9SEric Sesterhenn printf("Inode 0x%08x corrupted\n", i); 426e1f89ec9SEric Sesterhenn 427e1f89ec9SEric Sesterhenn brelse(bh); 4285998649fSAl Viro ret = -EIO; 4295998649fSAl Viro goto out3; 430e1f89ec9SEric Sesterhenn } 431e1f89ec9SEric Sesterhenn 432c2b513dfSAl Viro if (!di->i_ino) { 4331da177e4SLinus Torvalds info->si_freei++; 434c2b513dfSAl Viro continue; 435c2b513dfSAl Viro } 4361da177e4SLinus Torvalds set_bit(i, info->si_imap); 437c2b513dfSAl Viro info->si_freeb -= BFS_FILEBLOCKS(di); 438c2b513dfSAl Viro 439c2b513dfSAl Viro eblock = le32_to_cpu(di->i_eblock); 440f433dc56SDmitri Vorobiev if (eblock > info->si_lf_eblk) 441c2b513dfSAl Viro info->si_lf_eblk = eblock; 4421da177e4SLinus Torvalds } 443c2b513dfSAl Viro brelse(bh); 4444e29d50aSArtem Bityutskiy brelse(sbh); 4451da85fdfSFabian Frederick bfs_dump_imap("read_super", s); 4461da177e4SLinus Torvalds return 0; 4471da177e4SLinus Torvalds 4485998649fSAl Viro out3: 4495998649fSAl Viro dput(s->s_root); 4505998649fSAl Viro s->s_root = NULL; 4515998649fSAl Viro out2: 4525998649fSAl Viro kfree(info->si_imap); 4535998649fSAl Viro out1: 4544e29d50aSArtem Bityutskiy brelse(sbh); 4551da177e4SLinus Torvalds out: 4565998649fSAl Viro mutex_destroy(&info->bfs_lock); 4571da177e4SLinus Torvalds kfree(info); 4581da177e4SLinus Torvalds s->s_fs_info = NULL; 459e33ab086SDavid Howells return ret; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 462152a0836SAl Viro static struct dentry *bfs_mount(struct file_system_type *fs_type, 463152a0836SAl Viro int flags, const char *dev_name, void *data) 4641da177e4SLinus Torvalds { 465152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super); 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4691da177e4SLinus Torvalds .owner = THIS_MODULE, 4701da177e4SLinus Torvalds .name = "bfs", 471152a0836SAl Viro .mount = bfs_mount, 4721da177e4SLinus Torvalds .kill_sb = kill_block_super, 4731da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4741da177e4SLinus Torvalds }; 4757f78e035SEric W. Biederman MODULE_ALIAS_FS("bfs"); 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds static int __init init_bfs_fs(void) 4781da177e4SLinus Torvalds { 4791da177e4SLinus Torvalds int err = init_inodecache(); 4801da177e4SLinus Torvalds if (err) 4811da177e4SLinus Torvalds goto out1; 4821da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 4831da177e4SLinus Torvalds if (err) 4841da177e4SLinus Torvalds goto out; 4851da177e4SLinus Torvalds return 0; 4861da177e4SLinus Torvalds out: 4871da177e4SLinus Torvalds destroy_inodecache(); 4881da177e4SLinus Torvalds out1: 4891da177e4SLinus Torvalds return err; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 4931da177e4SLinus Torvalds { 4941da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 4951da177e4SLinus Torvalds destroy_inodecache(); 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds module_init(init_bfs_fs) 4991da177e4SLinus Torvalds module_exit(exit_bfs_fs) 500